He's widely considered the Chaos-aligned counterpart of Corax. The two probably would've gotten along pretty well had they been in the same sector during the great crusade. His name is an oblique reference to Heart of Darkness.

Contents

Curze wound up on the eternally-dark world of Nostramo after the Primarchs were scattered by Chaos. Unlike most Primarchs, no one took Curze in, and he had to raise himself. It should also be noted that while the other Primarchs landed in style with awesome stasis pods like God descending from Heaven, Curze ended up punching through the Adamantium crust of Nostramo and embedded himself into the core. Where he decided it kinda sucked and dug himself out back where he wouldn't have to worry about temperature hot enough to fuck Vulcan up the ass as an infant. Nostramo was a lawless hell-hole, where crime was rampant and usually went unpunished, the rich openly exploited the poor, depression and the inability to escape one's social standing was rampant, and the population was largely kept down not through any fancy measures, but suicide. Curze was enraged by how this panned out and as he grew he decided to take matters into his own hands.

Stalking the eternally-dark streets as a sort of Space Marine Batman, Curze began hunting down heretics and those who had been responsible for turning Nostramo into the cesspit it had become. Leaders of the corrupt administration disappeared, only to be found later hung from Imperial administration buildings and beaten into unrecognizable messes that couldn't be identified without DNA testing mutilated, though their faces were often untouched so people would instantly recognize the victim. Notorious criminals were found out in the streets, eviscerated or impaled and left to die on the spires of manufactorum rooftops. The blood of those who had committed crimes flowed in the streets, with body parts stopping up storm drains.

The really scary part? It worked. Within a year, Curze had killed so fucking many dicks that the crime-rate of Nostramo reached damned-near zero. Society went through a massive upheaval and curfews were imposed to minimize the casualties from Space Marine Batman. Mothers began to threaten their kids that if they continued to misbehave, the Night Haunter would come for them - a story that came into common use on Nostramo, describing Curze, who stalked through the city, ready to disembowel any heretic or criminal foolish or bold enough to cross his path with anything on hand. His favored weapons of 'Lightning Claws' weren't used until he was found by the Emperor and united with his legion, which also made armor and weapons available to him.

Curze became convinced of his choices being the right and just ones when he saw that the people of this world started to have hope again - he had become the only thing on the entire planet that people truly feared (and hated). Seizing the moment, Curze appeared before the few remaining nobles that had survived his vigilantist purges - the only ones who basically weren't complete assholes, and gave them a choice: Obey to his rule, or die. Curze, the Night Haunter, was then made the ruler of Nostramo.

To the surprise of most, Curze proved to be a fairly capable ruler; surprisingly just and temperate. He made strong attempts to educate himself on absolutely everything he could learn, and was noted for his skills as an adjuticator, worthy of a Reasonable Marine. This was, of course, until word of an injustice reached Curze's ears - at which point he would hunt down the transgressor himself, wearing them down, and killing them horribly. His unpredictable pattern of benevolence and wisdom contrasted by jaw-dropping levels of violence beyond that of an Eversor ushered in a new era of efficiency and honesty across Nostramo on a planetary scale, mainly as an act of capitulation in order to keep the Night Haunter from their doors.

Soon after Curze took over and began ruling the planet, the Emperor's Great Crusade reached Nostramo; the coming of the Emperor of Man was an event long prophesied in Nostramo's history - an event which would eventually bring about the apocalypse. The Emperor and his delegation (which consisted of Rogal Dorn, Ferrus Manus, Lorgar Aurelian, Fulgrim, and their respective Legiones Astartes) proceeded to the Palace on foot, his radiance blinding the adapted-to-darkness onlookers and mesmerizing those who did not look directly at him.

At the end of the road leading to his Palace, Curze stood, waiting for the delegation when he had one of his visions, one so potent and horrifying, that he tried to claw his own eyes out to blind himself to what he had seen.

In THE HORUS HERESY: PRINCE OF CROWS it was revealed that what Curze saw was the fate of each of his brothers and in the end his own death, he saw blood spurting from his own neck and no matter what he did he couldn't stop it.
He would have succeeded in blinding himself if the Emperor hadn't stopped him.
He and the Emperor then had this badass exchange:

"Konrad Curze, be at peace, for I have arrived and intend to take you home."

"That is not my name, Father. I am Night Haunter, and I know full well what you intend for me."

Awesome. Curze began training under Fulgrim, who taught him of the Adeptus Astartes combat doctrines and began molding him to be a suitable leader for his role as the leader of the Eighth Space Marine Legion - the Night Lords.
Later it was revealed that during his training under Fulgrim, Curze had had one of his visions, this one about the Horus Heresy.
While he told Fulgrim this in confidence, he would later learn that one flaw Fulgrim had (beside dressing like a peacock), was that Fulgrim didn´t know the meaning of the word confidential or that the notion of what was told to him was done so in sacred trust between himself and his favored brother.
Well the joke seemed to be on Curze as no sooner had he told Fulgrim about the vision then Fulgrim ran over to Rogal Dorn and told him everything.

Though Curze and his legion excelled in many different hot-zones throughout the Great Crusade, a disturbing tendency arose in short order; The Night Lords would never use anything other than total, decisive force to achieve their goals. The Night Lords quickly adapted to Curze's combat and tactical ethos, becoming one of the most brutally effective, if not ruthless, legions in the Imperium. The Night Lords decorated their armor with iconography designed to inspire terror in the enemy - a tactic that proved incredibly effective. Unsurprising, considering how terrifying Space Marines are without it. Where they struck, the Night Lords left examples - grim reminders of the price for disobeying the Imperium. In time, it became so that even the mere mention of the Night Lords' approach would cause a system to pay all outstanding tithes, cease all illegal activities, stop downloading torrents of Blossom, and put to death any mutants or heretics. In hindsight, though, we here on /tg/ can't really be all that surprised by their brutality when we remember it was Fulgrim who tutored the VIII Legion's primarch. How else would the Night Haunter interpret the Phoenician's excessive battlefield perfectionism than a need for excessive violence?

Problems arose, however, as the Great Crusade dragged on - reinforcements to replace the Night Lords that fell in battle were, as was the case of the other Legions, selected from the population of Curze's homeworld, Nostramo. Unfortunately, in Curze's absence, the population collapsed into the same corruption, criminality, and despair that had ruled the roost before his arrival (which, given the strong Imperial presence on the world, especially since it was literally made out of ridiculously rare adamantium, makes no sense at all). The most ruthless of the criminals were the only ones healthy and strong enough - and these were the most common replacement recruits for the Night Lords. Insubordination to Curze's orders became more frequent and he began having to deal with his own measure of "fixing" things with the criminal scum that were inducted into his forces. Making matters worse, his visions continued to increase in both frequency and graphic severity.

Finally, it reached the point where Curze had no choice but to deal with the problem of his recruiting world turning into a wretched hive of scum and villainy, but Fulgrim, the only Primarch Curze had any real connection with, was largely unavailable, and the other Primarchs, instead of listening to him and trying to help, bitched him out and said that it wasn't their problem.

The straw that would finally break the camel´s back was during a joint operation between The Night Lords and the Imperial Fists.

Rogal Dorn had taken issue with Curze´s way of doing things, saying that peace through fear was not what the Emperor of mankind had intended.
Konrad Curze decided to prove his point to Dorn; that without the fear of consequences people wouldn't stay loyal.
To illustrate this, Curze gave one of the prisoners a gun and then ordered his men not to interfere, no matter what might happen.
The Prisoner, now confident that the Night Lords wouldn't shoot him, immediately raised the gun and fired at Curze, thereby proving Curze's point.
Once the fear of consequence has been removed people will feel no loyalty, and having proved his point, Curze executed the prisoner by snapping his neck.

Now, if Rogal Dorn had been a smart primarch, he would just have left well enough alone, or perhaps, told Curze that one could rule through being loved and trusted just as well as being feared. But as established before, the Emperor hadn't exactly designed the Primarchs with brains in mind. So in an effort to win the argument, Rogal revealed what Fulgrim had said to him about Curze's vision. The anger, and the betrayal of trust while in the grip of one of his visions, Curze attacked Rogal Dorn with the claws on his armor´s fingers, slashing Rogal´s face to such a degree that if Rogal hadn´t been a primarch he would have died from his wounds.

As it was, Curze was just put on house arrest/grounded until the matter of an unsanctioned attack (read two missing primarchs) by one Primarch towards another could be resolved.
Curze however after reading a special batch of Nostraman tarot cards said "Screw you guys, we're going home". Killing the Imperial Fists who were guarding him, he and the Night Lords set course towards Nostramo.

Curze tried to salvage things while on his homeworld, but the Emperor's arrival had removed the one last barrier the people of Nostramo had between themselves and utter despair: ignorance.

Of course, the "Prince of Crows" heavy hinted, Curze didn't do anything other than kill people and incite fear by doing so. No improving the infrastructure, setting up a police force, or anything. And Curze refused to see this as a problem. This could have only lasted so long. In all actuality, the Emperor's arrival just sped things up. It wasn't the other Primarchs' problem, it was Konrad's mess and his one trick wasn't working anymore.

The knowledge of other worlds beyond Nostramo inflicted a hopelessness that guaranteed that nothing on Nostramo could ever change... which makes no sense given both the facts that the Imperium had massively improved their lives and that Nostramo had been trading its adamantium to several other human star systems long before the Imperium arrived (though "Prince of Crows" shows that this was because Curze made it so that there was nothing to do on Nostramo besides "behave and slowly die in an adamantium foundry" or "become a criminal and have some fun before dying quickly"), leaving the world to fester in corruption and depravity like a metastasized tumor. This was made worse by the Imperial Governor appointed to rule Nostramo in Curze's absence, who's corruption-heavy regime more-or-less plunged the entire planet into the same shit that gave birth to the Night Haunter in the first place. Needless to say, Curze was absolutely pissed at his planet and his work going back to square one.

Imperial pursuit craft, determined to stop Curze for abandoning the Great Crusade and checking on his homeworld, arrived just in time to see the lascannon batteries of Curze's fleet put an end to the nightmare that the planet's inhabitants had found themselves in - the only way he knew how, destroying the planet with sustained orbital fire.

Curze's actions caused him to be especially vulnerable to the whispers of Chaos. The campaigns of the Night Lords became harder and harder to justify - terror campaigns leaving a trail of devastated worlds across the breadth of the galaxy. Curze abandoned his devotion to the Emperor, instead fighting only to spread death and fear. Eventually, it got so bad that the Emperor recalled the Night Lords and prepared to call Curze to task for his actions and that of his legion.

This was 20 years before the Horus Heresy mind you, and it is very likely that the Imperium thought he had gone rogue at that point, or at the very least, completely unhinged for blowing up his homeworld. Especially, since they had been recalled to account for their terror campaigns and war crimes. So it's a bit bizarre that the loyalists thought it was a good thing that the Night Lords showed up to support them at Isstvan and didn't see a double-cross coming.

When Horus turned against the Emperor with Fulgrim, Curze was quick to throw in his lot behind the brothers he had actually been able to relate to as opposed to the fucking asshole. He even ended up saving Lorgar from Corvus Corax (although after seeing the Gal Vorbak, the very first squad of Possessed Marines, felt it was a mistake).

The Night Lords remained impious, siding with none of the Chaos Gods and instead using them as mere tools in their terror campaigns. Almost entirely populated by criminals and murderers, the Night Lords led the Dark Angels and the Lion all over the Eastern Fringe. The insanity doesn't end there. In the middle of dicking with the Angels, he invites Lion El'Jonson to a dead planet (future place of his new palace and his own death...) to deliver a message from Horus, which actually predicts the Dark Angels fate of everyone hating their guts for not being on Terra because Curze has lead them all over the Eastern Fringe (HAR HAR HAR).

The Lion, who has zero tolerance for insults, proceeds to attack Curze and gets a fantastic one-shot off on him, though that was all he'd get and the two descended into a brawl which had to be ended with the brothers getting pulled off of each other and dragged back to their respective fleets.

The Dark Angels would eventually get the upper hand, presumably because Curze was partly pre-occupied by his "guest" (see below) and because the Lion would start using a powerful and sentient warp engine that allowed him to out maneuver the Night Lords and capture Curze temporarily; essentially breaking the back of the Night Lords Legion. (Sevatar took over, killed most of the leading captains and told the fleet to disperse and do whatever it was they wanted)

Vulkan becomes Konrad's prisoner after Isstvan V. Unfortunately, Vulkan is immortal or some shit, so he keeps coming back from the dead. This pissed the shit out of Curze, who decided to torture him instead. He had to do all kinds of shit, including being forced to kill his own Salamanders, watch prisoners starve themselves, and fight Corax in a dream. In the end though, Curze couldn't bring Vulkan down to his level, causing massive amounts of rage.

SPOILER ALERT*

Vulkan ended up in a maze built by Perturabo, with his hammer at the end of it. Vulkan had a teleporter in his hammer, which he figured Curze didn't know about, which made him hopeful. He couldn't navigate the maze worth shit though, and he was pretty much fucked, but after a couple of days, he pissed off Curze, who then led him to the center so they could fight. Curze was all "fuck you, teleporters don't work here", to which Vulkan replied, "O rly bitch? I still have a hammer". Vulkan then proceeded to beat the shit out of Curze, but didn't kill him (Because that would be stooping to his level, apparently).

When he was done, Vulkan said (essentially) "Fuck you Curze, I'M VULKAN! So MY teleporters work here. I just wanted to beat the shit out of you". He then escaped, leaving Curze more emo, depressed, and filled with more RAGE than ever before. Not that this mattered because Curze subsequently went on to take out his considerable ire against the entire Dark Angels Legion, leading to an impressively murderous trip to Macragge where he role-played a combination of every slasher movie killer and went with whatever felt natural. He would have killed the Lion AND Roboute with a powerful explosion (he had set the chapel of Hera to explode with them in it) if it hadn't been for the power of friendship. Seriously...friendship truly is magi*BLAM*

After being jumped by a bottled demon and briefly being dragged into the warp, Kurze managed to kill (as in completely, not just banishing) the demon, and being dumped back onto Macragge. He's yet to reappear but he has the entire planet on curfew whilst he's still (theoretically) around.

They got there late to the party but still got shit done, inflicting considerable morale damage on the loyalists. The Emperor however, wishing to stop the Night Lords forevermore, dispatched an Officio Assassinorum operative from the Callidus Temple to kill him.

Curze had foreseen this, however - and he allowed it. He allowed her into his palace and the Callidus encountered no guards between herself and his throne room. Confronted with the Callidus Assassin M'Shen, it is believed that Curze proceeded to make jokes about how she had butt-sex with Macha before getting down to brass tacks and explaining why he'd allowed her in so easily:

"Your presence does not surprise me, Assassin. I have known of you ever since your craft entered the Eastern Fringes. Why did I not have you killed? Because your mission and the act you are about to commit proves the truth of all I have ever said or done. I merely punished those who had wronged, just as your false Emperor now seeks to punish me. Death is nothing compared to vindication."

Whilst it's never been confirmed who came out on top (or whether or not the Callidus and he engaged in hardcore ball-busting sex), it is believed by many that Curze allowed himself to be killed, having given explicit orders to the Night Lords to allow M'Shen to escape. Only one Night Lord, Apothecary Talos Valcoran of the 10th Company, pursued her out of vengeance (the Night Lords did eventually join in pursuit, but that was only after the senior Captains realized that M'Shen had looted Curze of all his bling, which they wanted for themselves). It is believed that Curze had come to see himself as a murderous and corrupt villain - the very thing he had sought out to destroy (or perhaps he wished to prove that his decision to destroy Nostramo and join Horus was justified, as the Emperor had become one more tyrant who had to be slain). Maybe he was the hero who lived long enough to become the villian (Space Marine Batman). We may never know the full story behind his actions, and his final words are considered one of the most bizarre enigmas in the Imperium's history.

Although knowledge of his gifts apparently were not widespread amongst the ranks of his brother Primarchs, Curze was capable of mild feats of psychic display. This was first evidenced by what he would come to call his "affliction" or "curse". Namely, that Konrad was often wracked by horrible visions, likened to waking nightmares, of how people would die. He was no exception; as stated above, the Night Haunter had foreseen his own death from the moment he awoke on Nostramo. These visions also occasionally extended to those he would lay eyes upon. This included his brother Primarchs, and explained his fondness for Fulgrim - the one person who Konrad had not seen suffer a terrible death upon first meeting him. In fact, Konrad's vision after laying eyes on Fulgrim was often described as hazy or lacking in some quality. What was apparent was that Fulgrim somehow found a way to cheat death. It was when he laid eyes on Ferrus Manus, immediately after, that he was shown Fulgrim would somehow be present at the site of Ferrus' demise. Despite this, he was the one primarch whom Konrad didn't foresee a misfortunate or ghastly future. It was this closeness that eventually led Konrad to confess to Fulgrim the nature of the visions he had received, as detailed in the popular duology of Black Library short stories The Dark King and The Lightning Tower

The Night Haunter also displayed a few other feats of psychic development, such as telekinetically destroying a series of lights to aid in his escape from a VII Legion detention chamber, and psychically conversing with Jago "Sevatar" Sevatarion. Sevatar, a latent psyker, was exploring Konrad's psyche during the later's unconsciousness resulting from wounds inflicted by the Lion El'Jonson during the Thramas Crusade. Apparently the Night Haunter had a role in helping to suppress Sevatar's psychic potential, as revealed in the conversation between them - and that, because Sevatar was not trained in their use, those psychic abilities would be increasingly self-destructive.

As the Primarch of the VIII Legion, Konrad had a servant throughout the Great Crusade named Ekra Trez (who bore the title of "Sin-Eater"). Trez was tasked with keeping a record of the Night Haunter's pre-cognitive visions in a massive tome, and would often make note of which ones had been proven correct or false. Trez was also more than aware of Sevatar's psychic ability, leaving some readers of the Black Library's Horus Heresy novels curious as to what role Trez may have played in the Primarch's psychic development - if any.

The Night Haunter, in his death, may have continued to leave a lasting impression upon the Imperium as inspiration for one of it's many institutions. Although his legion continues to sow fear and discord amongst the stars, Konrad Curze's legacy of weaponized fear lives on within the Imperium through the Emperor's Holy Ordos of the Inquisition. Like the inquisitors of the 41'st Millennium, Konrad brought loyal citizens into compliance through fear and threats of death/torture beyond imagining to those who weren't sure where their allegiances lay. Those who failed to comply were guaranteed either a swift death at the hands of his legion, or a slow death at the tender mercies of his legion's most depraved souls. Lastly, if those comparisons weren't enough, look at the fate of Nostramo - Konrad essentially carried out an act of Exterminatus. Just as Lorgar's teachings on the Emperor's divinity would later lay the foundation for the Imperial Creed of the Ecclesiarchy, the Night Haunter could effectively be treated as the first author of the Inquisition's playbook.

Wristblades? Check. Stealth capabilities? Check. Skinning prey and taking trophies? Check. Now he just needs a shoulder mounted plasma gun and he'll be able to pass himself off as the Predator.

WS

BS

S

T

W

I

A

Ld

Sv

Konrad Curze:

8

6

6

6

6

7

5+1

10

2+/4++

On the tabletop, Curze has the basic Primarch statline plus Shrouded and Stealth. He has several fear based abilities, such as granting fear to all Night Lords (those who already have Fear impose a -1 on the leadership test), fear tests when in combat with him are taken at -3LD, and if he kills a unit in close combat any unit subject to fear within 12' and line of sight must take a leadership test or fall back. Sire of the Night Lords also grants him the Acute Senses and Night Vision USR, and he may elect to have the first turn of any game have the Night Fighting rule. His weapons are 2 Lightning Claws called Mercy and Forgiveness which have AP 2, the murderous strike rule and grants +1 attack (Paired) and his armour, the Nightmare Mantle, provides 2+ armour save and 4+ invulnerable save (like most Primarch Armour), plus it grants him hit and run and hammer of wrath special rules (inflicting d3 HoW hits instead of the usual one).

Best of all, his ranged weapon proves definitely that Konrad Curze is Batman. He literally uses Batarangs during the shooting phase. His ranged attack is called a "Widowmaker Volley", which is essentially 3 bolt pistol profile shots with a special rule that makes 6s to wound ignore both armor AND invulnerable saves. You can't save against the God-Damned Bat Man. The best part is the actual description of the weapons in the Horus Heresy rulebook: "The Widowmakers: Based on the shuriken throwing stars MICRO-SERRATED THROWING BLADES utilized for signature-kills by the League of Shadows CERTAIN NOSTRAMAN ASSASSIN-CULTS, Curze favored the use of these vicious, yet highly precise weapons over more conventional firearms in battle, using them for non-lethal takedowns TO DISABLE AND MAIM AS HE WILLED."

Primarch fighting, while fun to see, isn't a very competitive thing to do as it'll usually tie up both Primarchs for the entire game without either of them dying. With that in mind this section is about how Konrad Curze fares against other Primarchs Mathhammer wise. Please note that all the various abilities are taken into accounts when possible and the match-ups assume the Primarchs are the only ones involved in the fighting, so various abilities like Angron's "The Butcher's Nails" and Rampage do not provide any bonuses. In essence, the fights are supposed to happen in a "Vacuum" for simplicity, but notes are added to make things clearer in particular instances. Also all of the Primarch use their most powerful weapons (because why have a contest if you don't do your best?).

Konrad Curze VS Horus

Horus hits 3 times (Talon), wounds 2.667 times, 1.333 after saves and IWND will take that down to 1 wounds at the start of the next turn.

Konrad hits 3 times, wounds 2.25 times, 0.75 wounds after saves and IWND will take that down to 0.417.

Konrad lose (not a big surprise) and as always Horus use his Talon 'cause, even though he would do more damage with Worldbreaker, the Talon allows him to make his opponent basically harmless after a couple of wounds.

Konrad Curze VS Angron

Angron Round 1: hits 5.333 times, wounds 4.444 times, 2.222 after saves, and IWND take it down to 1.889.

Angron Round 2 and thereafter: hits 4 times, wounds 3.333 times, 1.667 times after saves and IWND will take that down to 1.333 wounds at the start of the next turn.

Curze hits 3 times, wounds 2.25 times (0.75 of which causes ID), 1 wounds after saves and FNP and IWND will take that down to 0.667 wounds at the start of the next turn.

Angron easily wins, doing a lot more damage and receiving less in turn.

Note: Curze can Hit & Run, but by doing so he would only gain one more attack, while allowing Angron to reset his Hatred, thus actually making himself dies even faster. However he would be a much better fight: Konrad on the Charge would do 2.625 wounds (0.875 with ID) which become 1.168, plus 0.1389 for HoW and 0,359 for the Widowmakers, for a total of 1,666 wounds, or 1.333 after IWND. This, thanks to the -1 wound of Angron, actually means that they would kill each other on the fifth assault, at the same initiative step. Provided that Konrad always succed in his escape, that is.

Curze hits 4 times, wounds 2.222 times, 1.11 wounds after saves and IWND will take that down to 0.555 wounds at the start of the next turn.

Curze lose as even thoug he does more damage Mortarion has 1 wounds more that will make him outlast the Night Haunter.

Note: with the Hit & Run tactics Konrad would actually win, thanks to the +1 attack on the charge, HoW and the knives, butchering Mortarion in 9 rounds while Mortarion would need 11 (counting overwatch).

Konrad Curze vs Fulgrim

Fulgrim hits 3.5 times, wounds 2.333 times, 1.167 times after saves and IWND will take that down to 0.833 wounds at the start of the next turn.

Curze hits 3 times, wounds 2.25 times, 0.75 wounds after saves and IWND will take that down to 0.417 wounds at the start of the next turn.

Easy win for Fulgrim. Even with Hit & Run, Konrad would not win this fight. Still, he would outdamge Fulgrim on the Charge (1.472 wounds after all saves, 1.139 after IWND) and he would loose only thanks to the superior initiative of the Phoenician, coming extremely close to claiming a surprising draw.

Konrad Curze vs Ferrus Manus

Ferrus hits 2.5 times, wounds 2.083 times, 1.042 times after saves and IWND will take that down to 0.709 wounds at the start of the next turn.

Curze hits 4 times, wounds 2.222 times, 0.741 wounds after saves and IWND will take that down to 0.407 wounds at the start of the next turn.

Ferrus win.

Note: Even though with Hit & Run Konrad could close the gap and do almost the same exact damage as Ferrus over the course of the fight, mathematically winning thanks to his superior initiative, this tactics is not reliable against the Gorgon thanks to the Concussive & Strikedown of Forgebreaker.

Konrad Curze VS Vulkan

Vulkan hits 2 times, wounds 1.666 times, 0.833 wounds after saves and IWND will take that down to 0.5 wounds at the start of the next turn.

Curze hits 4 times, wounds 2.222 times, 0.741 wounds after saves and IWND will take that down to 0.185 wounds at the start of the next turn.

Vulkan is just too tanky for Konrad.

Note: with the usual tactic of Hit & Run Curze would outdamage Vulkan, but this is hindered by the fact that Dawnbringer has Concussive, making it difficult to foresee: it could go either way. (Because it's also a Hammer.)

Konrad Curze VS Lorgar

Lorgar hits 2.5 times, wounds 2.0833 times,1.042 after saves and IWND will take that to 0.708 wounds at the start of the next turn.

Curze Round 1: hits 3.555 times, wounds 2.369 times, 1.184 times after saves and IWND will take that down to 0.851 wounds at the start of the next turn.

Curze Round 2: hits 4 times, wounds 3 times, 1.5 times after saves and IWND will take that down to 1.167 wounds at the start of the next turn.

Konrad wins.

Note: as always, psychic powers not included. You know how it would end anyway...

Konrad Curze VS Perturabo

Perturabo hits 2 times, wounds 1.667, 0.833 wounds after saves and IWND will take that down to 0.5 wounds at the start of the next turn.

Curze hits 3 times, wounds 2.25 times, 0.75 wounds after saves and IWND will take that down to 0.417 wounds at the start of the next turn.

Konrad lose as Perturabo does marginally more damage.

Note: With Hit & Run Konrad would win, but the chance he is not concussed in the round he wants to escape are pretty slim, meaning that Perturabo has still the Edge in this fight.

Konrad Curze VS Alpharius

Alpharius hits 2.92 times and wounds 1.701 times, 0.851 wounds after saves and IWND will take that down to 0.517 wounds at the start of the next turn.

Curze hits 4 times, wounds 3 times, 1.5 wounds after saves and IWND will take that down to 1.167 wounds at the start of the next turn.

Konrad wins.

Konrad Curze VS Rogal Dorn

Dorn hits 2 times, wounds 1.5 times, 0.75 wounds after saves and IWND will take that down to 0.417 wounds at the start of the next turn.

Curze hits 3 times, wounds 2.25 times, 1.125 times after saves and IWND will take that down to 0.792 wounds at the start of the next turn.

Konrad wins thanks to his superior number of attacks.

Konrad Curze VS Corvus Corax

Corvus hits 4 times (Scourge)/3 times (Shadow-walk), wounds 3 times (Scourge)/2.25 times (Shadow-walk), 1.5 wounds (Scourge)/1.125 wounds (Shadow-walk) after saves and IWND will take that down to 1.167/0.792 wounds at the start of the next turn.

Curze hits 4 times/3 times, wounds 3 times/2.25 times, 2 wounds/1.5 after saves and IWND will take that down to 1.667/1.167 wounds at the start of the next turn.

Konrad wins.

Note: even though they both got Hit & Run Konrad doesn't get +1 attack to charge Corax, 'cause he has Shroud Bombs, and also doesn't get +1 S ans I, making Corax considerably stronger when he charge all things considered. All in all, a pretty balanced fight, even if the stats don't say so. Corax doesn't have Widowmakers, though...

Konrad Curze VS Roboute Guilliman

Guilliman Round 1/2: hits 2.5 times, wounds 2.222 times, 1.111 times after saves and IWND will take that down to 0.778 wounds at the start of the next turn.

Guilliman Round 3 and thereafter: hits 3.333 times, wounds 2.963 times, 1.481 times after saves and IWND will take that down to 1.148 wounds at the start of the next turn.

Curze Round 1: hits 4 times, wounds 3 times, 1 times after saves and IWND will take that down to 0.667 at the start of the next turn.

Curze Round 2 and thereafter: hits 3 times, wounds 2.25 times, 0.625 times after saves and IWND will take that down to 0.292 at the start of the next turn.

Konrad lose.

Note: as always, Konrad could attempt to even the odds with Hit and Run, negating Preternatural Strategy while gaining the +1 attack for the charge (and sniping some wounds with his knives). But so long as Guilliman uses his power fist by the second round of combat Curze will be locked to initiative 1 and will be dead before it's guaranteed he'll be able to leave combat.

TLDR version: Even though he does a lot of damage, Konrad is not really suited for Primarch vs Primarch fights. Do not misunderstand: he is a real beast when he can make use of Hit & Run and the Widowmakers are extremely good, especially against Primarchs with strong invulnerable saves. Still, you have to consider that all of his special rules are primary designed to scare his opponents and make them flee, but since all Primarchs are Fearless he can't use them. Despite this, he can win some fights and, when he struggle, he can still significantly cripple even some of the strongest Primarchs, leaving them weak and vulnerable. But you are arguably best served to employ his mobility to evade them (instead of fighting) and charge something he could actually butcher in a single round, to make the most of his King of Terror special rule. Make their allies flee in panic and then destroy them when they are alone and surrounded...

Now, we all know the Black Library can range from the godly to the Goto. So this must be taken with a grain of salt. But Lords of the Night implies that Curze suffered from Dissociative Identity Disorder, such that he and the Night Haunter were two different people, Konrad the just leader of men, and the Night Haunter the murderous vigilante. 'Blood Reaver' also implies it (a Night Lords sorcerer talking about how at one moment he was trying to teach his long-dead father some idealistic lesson, while at another he was only concerned about eating some slave's heart.) and shows it outright (when he has a bit of a manic episode and forgets that his First Captain died several years ago.) 'Blood Reaver' also suggests that the Emprah's DNA may not have entirely settled in Curze's body, explaining why he was so batshit crazy by the time of his death, not to mention the corpse like appearance he was sporting near the end.

The upshot of this is that only the Night Haunter fell to Chaos, while Curze remained clean. Which one got the other killed is unknown.

Another thing perhaps tied with his Multiple Personality Disorder is that Konrad Curze towards the end had ended up hating his own legion.
In a conversation with First Captain Sevatar, Konrad mentioned how he had spoken with Angron and Lorgar following the Istvaan 3 purge.
Cleansing the untrustworthy elements of the World Eaters and the Word Bearers. The sheer absurdity of the idea was laughable to the Night Haunter,for his brothers knew exactly when to stop the killing of the weak, the treacherous and the corrupt within their bloodlines.
He had no idea where to begin culling the Night Lords' ranks. His sons were no longer cast in his image. Less than a decade after he had departed Nostramo that world had sent him nothing but filth to integrate into the VIII Legion as Neophytes; the disgusting dregs of humanity his own Apothecaries had infused with his genetic material and reforged into transhumans.
The VIII Legion had become poisoned by their presence.
The VIII Legion was now composed of warriors who were murderers in the Primarch's own image, yet devoid of his conviction.
The Night Lords had become nothing more than killers and abusers, bleeding the weak for their own amusements because they enjoyed it as good sport. Fear became an end unto itself, and its propagation was all the Night Lords desired as they fed upon it.

This was made even more clear by what Curze told Talos before he and the Assassin was to get it on.
"Many will claim to lead our Legion in the years after I am gone.Many will claim that they - and they alone - are my appointed successor. I hate this Legion, Talos. I destroyed its world to stem the flow of poison. I will be vindicated soon, and the truest lesson of the Night Lords will be taught.Do you truly believe I care what happens to any of you after my death?"

Now some might say he was overreacting a bit but, still given how the criminal overlords he had spend most of his life on Nostramo eradicating, took over again as soon as he had left the planet and started sending their henchmen to be turned into space marines, it might be understandable. It was not for nothing that Horus had cause to muse that his generals were psychopaths while the Emperors were noble, statuesque leaders of men.